What do your ears tell you? If it sounds good it is good. Maybe less good but as long as you are happy, who cares? I like the optical in from my Sony consoles into my Bifrost Uber. Less so from my Xboxen. Source quality matters.
I don't have direct comparison of optical and coaxial, I just feel my Modius sounds kinda congested, with not much of layering or instrument separation. Compared to Airist R2R, Modius's dynamic felt weak, so... not happy.
OK, I found a coaxial cable! So, quick comparison: optical input sounds more two dimensional, mids seems thinner, and the bass seems less also... But coaxial input gives me more congested feeling, seems like it generates some sense of depth by pulling the vocal closer while optical sounds more laid back. I prefer coaxial input on Modius.
Oh, my source is Pi2AES, and I didn't use USB input for long, as it generated noise over time, replugging USB cable resolved the problem for some short time, but it would come back. I guess the problem was more on my PC.
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